Ten million electrons pass from point P to point Q in one micro second. The current and its direction is

Question

Ten million electrons pass from point P to point Q in one micro second. The current and its direction is (A) 1.6 × 10-14 A, from point P to point Q (B) 3.2 × 10-14 A, from point P to point Q (C) 1.6 × 10-6 A, from point Q to point P (D) 3.2 × 10-12 A, from point Q to point P

Tardigrade Admin · Accepted Answer

Here, number of electron, n = 10000000 = 107 Total charge on ten million electrons is Q = ne [where e = 1.6 × 10-19C] =107 × 1.6 ×10-19 C=1.6 ×10-12 C Time taken by ten million electrons to pass from point P to point Q is t=1 μ s=10-6 s The current I=(Q/t)=(1.6 ×10-12/10-6) =1.6 × 10-6 A Since the direction of the current is always opposite to the direction of flow of electrons. Therefore due to flow of electrons from point P to point Q the current will flow from point Q to point P.

Q. Ten million electrons pass from point $P$ to point $Q$ in one micro second. The current and its direction is

$1.6 \times 1 0^{- 14} A$ , from point $P$ to point $Q$

$3.2 \times 1 0^{- 14} A$ , from point $P$ to point $Q$

$1.6 \times 1 0^{- 6} A$ , from point $Q$ to point $P$

$3.2 \times 1 0^{- 12} A$ , from point $Q$ to point $P$

Q. Ten million electrons pass from point P to point Q in one micro second. The current and its direction is

1.6×10−14A, from point P to point Q

3.2×10−14A, from point P to point Q

1.6×10−6A, from point Q to point P

3.2×10−12A, from point Q to point P

Q. Ten million electrons pass from point $P$ to point $Q$ in one micro second. The current and its direction is

$1.6 \times 1 0^{- 14} A$ , from point $P$ to point $Q$

$3.2 \times 1 0^{- 14} A$ , from point $P$ to point $Q$

$1.6 \times 1 0^{- 6} A$ , from point $Q$ to point $P$

$3.2 \times 1 0^{- 12} A$ , from point $Q$ to point $P$